using System;
namespace helloworld
{
    public class Student
    {
        public string S_name; 
        protected int S_age; 
        protected  string  S_number; 
        public Student() 
        { 
            S_name = "Unknown"; 
            S_age = 18;
            S_number ="201108501"; 
        } 
        public Student(string name,int age,string number) 
        { 
            S_name = name; 
            S_age = age;
            S_number = number; 
        }
        public void Show()        
        {
            Console.WriteLine(S_name);
            Console.WriteLine(S_age);
            Console.WriteLine(S_number );
        }
    }
    class Program
    {
        static void Main()
        {
            Student stu1=new Student();			
            Student stu2 = new Student("",20,"201005101");	
            stu1.Show();
            stu2.Show();
            Console.ReadLine();
        }
    }
}
